Rock-drill.



H. W. BURGESS (in J. HBIWORTH.

ROCK DRILL.

APPLIGAIIDN nun) JULY 3.1908.

Patented Oct. 19, 1909.

INVENTORs ml: 14 aunasss. JOSEPH HPWORTH,

By M ATTORNEYS WITNESSES:

HYLA W. BURGESS AND JOSEPH HEPWORTH, OF ALBION, IDAHO.

ROCK-DRILL.

Specification of Letters Patent.

Patented ()et. 19. 1909.

Application filed July 3, 1908. Serial No. 441,800.

To all whom it may concern:

Be it. known that we. llYliA I lit'nonss and Josnrn llnewoa'rn. ('iti7 ns of the United States of Ameriea, residing at .\lhion, in the County of (assia and itate of Idaho, have invented new'and useful linprovemen'ts in lt a-k-Drills. of whieh the following is a speeitieation.

This invention relates to roelt drills and more espeeiallyto that elass where a lilo-i is antomatieally delivered to the head of the drill h v hammers \vhieh are rotated as will he more fully deserihed in the following speeilieation. set forth in the elaims and illustrated in the drawings.

Figure 1 is a side elevation of the drill a part heing shown in seet ion. Fig. 2 is a vertieal sectional view on the line in the shaft. Fig. I) is a seetional view of the drill arrier on the line YY. Fig. l is a simi ar seetional view on the line X-X.

The device is mounted on the standard I. of sutlieient strength and hraeed as shown in the drawings and in the upper end of this standard is a hearing in whieh is journated a driving shaft ti. The shaft earries tht) hal anee wheel I at one side of the standard and a pulley eranh may also he se med t the shaft for the purpose of aetuating the de viee. Seeured to the shaft 6 is a disk it) which earries pivo ed hammerstt and whose handles H are extended as arms 9' heyond the pivot and eonne ied with eaeh other by the springs 11 whieh normally hold the hammers in a position to deliver a blow hut permit them toyield and fly 'lJtH'lWUl'tl alter the hlow is Hll'llt'li. .\t one end of the shaft is a frame l2 for uprights lit andit the former of whirh is ada ited to t':lt'l' a drill l5. The drill is mountet in a ehuek l i whieh is adjustahle hy means of the sert-w thread I?- on the end of the head 5H and is normally held in ilsretraeted position h means of the spring lf eneireling th head and eonlined between the flange '3) and the upright l3. 'lhe ehuek [(3 has a groove ll in one side to reeeive the spline 12 of the ring 23 and the .latter has gearteeth .H with whieh meshes the .pinion 25. The pinion :25 is at the outer end of a rod .36 supported by the upright H aml an extension )7 of the upright 13 ivhieh also encircles the ehuek and retains the rm r 23 between its jaws 28. The other end 0 the rod 26 carries a hand-wheel Q!) to rotate the a, P n 2e2 In order todireet the drill the angle to ante is altered by shifting the frame 12 on the shaft 6 and when it reaehes the desired point it is loeked in position by means of the elamp 3t) operated by a lever 31.

In operating the drill the shaft is rotated so as to entry the hammers in the direction of the arrows in Fig. l. and as the hammers move the eome in eontaet with the drill head 18. As the shaft rotates the hammers are permitted toyield'through the tension of the springs 11 sullieiently to allow the hamm'er heads to pass beneath the lower edge of the head 18 and resumetheir normal position after passing beyond the influence of the springs 11. The handles of the hammers are eat-h provided with a boss or enlargement at the point where the arm 9' is integrally eonneeted-thereto, and the pivot pin extends through a hole in said boss and is rigidly eonneeted to the disk 10.

It is ohYiOus that minormodifications may he made in the eonstrnetion of the details of the derive without departing from the essential features ahove deserihed.

What we elaim as new anddesire to secure. h) Letters Patent is:

1. In a roek drill. the eomhination with a shaft. of an adjustable frame supported by same. a elatnp on the hase of the drill and adapted to ltold the frame in adjustment, :1 tllltt'lt. a drill head with serew threads working inthe elmelt. a toothed ring splined on the ehuek. a rod with a pinion operating the toothed ring and yielding hammers carried hy the shaft and adapted to strike the drill head. i

2. lii.a roek drill. the eomhination of a r tatahle shat't. a disk on said shaft; a plurality of hammers. eat-h having a head. a handl an integral arm extending at an angle to said handle. and a hoss at the point of iunetion of said handle and arm. a pivot pin extending through said hoss and eon netted to said disk. springs eonneeted to said arms on opposite sides of said Shaft. and a drillingtool provided with a head disposed in llltllalh of said hammer heads.

In testimon whereof we atlix our signa tures in presenee of two witnesses.

llYl..\ W. BURGESS. JOSEPH l-IIIPWOR'III.

Witnesses: l. I. VnnnnNnUltGn,

Jonn H. COOK. 

